I have been faxing outbound using XP for a month or so. I have noticed that when I try to fax to a 1-800 number it will not connect. I get a message "Did not pickup" on the PC. I can turn right around and dial from the handset and hear the fax tones.

Truly weird. For what it's worth, I fax to 800 numbers using my Vonage voice line with no problems, so it's not a generic issue. If might be worth a call to customer service. You have tried re-booting the Vonage adapter haven't you?

Well, I have come to realize that it is NOT just 800 numbers. I have recently ran into a few non toll free numbers that can't be connected to. Usually, it is the "NO ANSWER" error that I see. But if I pick up the same phone line and call from a handset, I can hear the fax tones fine.

I'd but a "regular" fax machine, but I am wondering if the same issues would remain. If your willing, I can PM someone a # to see if you are able to fax to it.